Maxima’s Maxum4 Extra is 100% synthetic motor oil featuring advanced additive technology. By using today’s most advanced additive systems and high-performance synthetic ester based stocks, Maxima has engineered what they believe to be the finest 4-cycle motorcycle specific oil available on the market today. The very latest shear stable polymer systems have been used to assure viscosity stability and virtually eliminate transmission “shear-down” of the oil.